Table closure may remove a different table from display

Assume an open table named X. A table named Y can be opened, where X is a substring of Y. If Y is closed before X, then entry X in the table display will be removed, yet Y will remain. Although X still exists, it will not be visible to users, unless they log out and log back in.

Example: open table "abc", then open table "abcdef", then close table "abcdef". Note that "abc" disappears in main window table display.

This is due to substring matching in pybridge/ui/window_main.py: "if model.get_value(iter, 0) in user_data:". A similar bug may occur with user names and logouts.

This bug appears to be present in all PyBridge releases, and may be fixed by changing the 'in' keyword to '=='.